There's literally nothing I can say about this game that hasn't already been said by others.

It is a ♥♥♥♥♥♥♥♥ masterpiece. I haven't, in the life of me, seen any other game do everything as right as The Witcher 3 does.

The world is gorgeous to say the least, with something interesting and new at every corner.
The storyline is absolutely smashing and kept me rushing all through story arc. The character development is amazing and you'll find yourself smitten to some of them really good. The side quests are equally good and stimulating as the main quests. This game is so emotionally stimulating, I could freaking cry.
The combat is great, and so is the skill tree. The character leveling is spot on, and allows you to rush through the main story if you will.
Don't even get me started on the soundtrack. Legit the best there has ever been in a game. Nothing beats hacking and slashing your way to "song of the sword dancer" (check it out on YouTube).
To top that off, the developers have released 2 amazing DLCs that could be games in themselves, and that was beside the ton of free content they already gave out. Both the DLCs had storylines that, I dare say, could be better than even the main quest line.
I've completed this game 4 times, on and off steam and it was not boring for a single second of it.
CD projekt RED deserve all the appreciation they can get for this legend of a game, and the overwhelmingly positive reviews on this game are a proof of that.
There is literally nothing I can immediately think of that would count as a con, except for the fact that your horse can be a ♥♥♥♥♥ in terms of movement sometimes.
I am not exaggerating when I say this; I regret purchasing this game on a discount. This game is worth every single penny (and more) of the normal retail price.
I'd shoot myself in the head before I'd give this masterpiece anything less than a 10/10.